StepFun

Chinese AI company building the Step foundation models

stepfun.comShanghai, China

StepFun is a Shanghai-based AI company founded in April 2023 by Jiang Daxin, Zhu Yibo and Jiao Binxing. It develops the Step series of language and multimodal models, including Step 3.5 Flash.

Releases

StepFun launches

4 launches. Same-day variants are grouped. Sorted newest first.

Step 5 Preview featured image

Step 5 Preview

StepFunOctober 15, 2026

Step 3.7 Flash featured image

Step 3.7 Flash

StepFunMay 29, 2026

Step 3.5 Flash 2603

Step 3.5 Flash 2603

StepFunApril 2, 2026

Step 3.5 Flash

StepFunFebruary 12, 2026

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